iPhone 13 Battery Health Drop

My iphone 13 battery health went from 100% to 99% after 3 months. Since last September 20 when I update to ios 16, my battery health is decreasing. Battery health has decreased by 4% in the last 20 days. Solve this problem?


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Posted on Oct 11, 2022 10:21 AM

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55 replies

Sep 16, 2023 8:05 AM in response to Lawrence Finch

I bought it new at the Apple store. Optimized battery charging is on and clean energy charging is on. I charge every night with Apple’s 5W brick and Type-A cable. I almost never let it under 20%, but it happened sometimes. Never have I let it discharge to 0% and I do a very light use of the phone. For example I’ve had 6 hours of lessons today and kept the phone in airplane mode the whole time. Got out of class with 70% battery. Could it be cuz I have an Apple Watch that’s always connected and always connected to GPS keeping track of bike workouts?

Sep 20, 2023 6:22 PM in response to rubbelyn

That’s about right. And 99%, if it just changed, means 99.9% because the gauge does not round, it just drops the tenths.


Batteries are consumables; they lose a little capacity every time they are discharged, then recharged. On average this works out to about a 1% loss for every 25 “full charge cycles”. As one example, if you charge the phone overnight, every night (and that is what you should do; it is a best practice), it starts the day at 100%. If it drops to 20% by the end of the day before you charge it again overnight that counts as 0.8 full charge cycles (20% to 100%), or about 24 full charge cycles per month of use. For this example your battery capacity will lose about 1% per month. Of course, if the end-of-day level is higher than 20% the capacity loss will be a little less, and if it is lower than 20%, or you charge it during the day, the capacity loss will be higher.


Once the capacity drops below 80%, or if there is a message in Battery Health that the battery is not meeting peak performance expectations, it’s time to change the battery→iPhone Battery Replacement - Official Apple Support


The absolute best way to get maximum use on a charge, as well as slow the decline of battery capacity long term is to enable Optimized Battery Charging (Settings/Battery/Battery Health) and charge the device overnight, every night. The battery will fast charge to 80%, then pause. During the nighttime pause the phone will use mains power instead of battery power, allowing the battery to “rest”, and thus reducing the need to charge the battery quite as often. The phone will resume charging to reach 100% when you are ready to use your phone; it will “learn” your usage pattern. If you enable iCloud Backup (Settings/[your name]/iCloud - iCloud Backup) the phone will back up overnight also, assuring that you can never lose more than the current day’s updates. Here's more information→About Optimized Battery Charging on your iPhone - Apple Support

Sep 21, 2023 11:19 AM in response to Robert Pearson

Robert Pearson wrote:

I am wondering why my iPhone 13pro battery capacity is suddenly reduced by up to 3 hours the week prior to the iPhone 15 release. Seems like Apple were fined millions for this same battery reduction scam a year or two back?

No, they were not. Apple settled a suit by people who were upset that Apple had not communicated properly why phones were being throttled. Apple was throttling the processors on phones with failing batteries so that the phones didn't shut down precipitously.


Maximum battery capacity is not measured in hours but in percent. If you go to Settings>Battery>Battery Health you can see your battery's maximum capacity. If is 80% or less, you need a new battery.

iPhone 13 Battery Health Drop

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